Probably because he's unaware of the older non-rotary Jobo tanks, the centre columns are slightly narrower than the Paterson but I use mine frequently with Paterson reels. Of course these tanks will take the Jobo 5"x4" reels anyway. I have 4 2000 series Jobo tanks and if I needed greater capacity I'd try a MOD 54.

My JOBO 2000 tanks are not designed for rotary processing but the previous owner of my second did use it on a roller, but there's no guarantee the reels will rotate properly which would be the same with a MOD 54 in a Paterson tank.

In addition the MOD 54 ccould be used in some JOBO tanks where there's a a centre column, I use my Paterson System 4 reels in JOBO 2000 series tanks.

Ian

So run this by me, with a 'rotating tank' how do you do stand development if you don't know where the negative is in the tank in relation to the very small amount of developer? Fill the entire tank with developer?

The great advantage of the Paterson/MOD54 setup over rotating tanks or trays is the ability to use semi stand and stand development, and especially with tanning Pyro developers. It gives far more control over highlights and shadows. But yes it does use more liquid, although this is the last consideration on my mind.

Steve

Unfortunately, this is not true.

You can do stand/semi-stand in any container that will hold the film. Open containers do pose some limitations, based on the oxidation rate of the developer being used.

There is no reason that you can't use the Jobo Expert series for this, nor their 2xxx and 1xxx tanks. All you need to do is put in enough liquid to fill the tubes to above film height.

A rotating tank is a tank that rotates. If it does not rotate it is not (used as) a rotating tank. Where have I missed the point? And the point was that a MOD54/Paterson tank can be used to stand develop six sheets of film which a rotating tank (obviously really) cannot. Additionally the use of a tray to stand develop a single sheet of film for maybe an hour also seems impractical given the oxidation, but not impossible, although you can try it, not me.

My original comment was perhaps slightly out of context because rotating tanks hadn't already been mentioned (but had in other threads) with discussion about how little chemistry is used developing 4x5 film, but there are other techniques available using a MOD54. But I did specifically say rotating, and did not allude to the generic use to which a Jobo tank can be put to.

Steve

Last edited by 250swb; 11-26-2012 at 03:39 AM. Click to view previous post history.
Reason: spelling

The MOD 54 is identical in design concept to the Jobo 4x5 processing reels. I have about 4 of these and they can be used for stand, dip and dunk or rotary. I get 6 sheets per holder and run 3 holders at a time for 18 sheets of 4x5 at one crack. This is usually color!

In the Mod54 reel the sheets can very easily fall out of the holder with the gentle inversion agitation in my experience, they even fall out of one side and go backwards one notch (when originally loaded properly), so I'm hesitant to put more than one sheet on each side.

I hate using the twirl agitation, but it works well for sheets and with this reel, I do slow gentle twists side to side with the paterson agitator stick with this reel, and haven't had problems with it since. Works well with colour.